Prior to describing methods employed to teach both library users and staff how to use the online catalog at Ohio State University (OSU), this paper presents a background of the development of the online catalog, now called LCS (Library Computer System), and a chronology of important points in the 17-year development, enhancement, and evolution of the online system. Among the basic elements required for staff and user training for the online catalog are a similar response and commitment on the part of the library to meeting the needs of both groups. The common requirements of the training programs include library personnel willing and qualified to lead workshops and meetings, and personnel able to write clear documentation and training materials. Other common features of training programs for both staff and public users include; (1) database content, (2) communication requirements, (3) display content, and (4) change, e.g., new system features. For both the staff and the public it is necessary to accommodate different levels of background and preferences in instructional approaches. The individual program designed must be feasible within the organizational structure and size of the particular library, including attention to such things as content and frequency of training, and times and places in which it will be offered. (THC)